Been looking for over an hour for an article on Rabbulas Evangelion de-Mepharreshe where it was shown it is one of the old Syriac texts (based on the name written on the manuscript). I'm sure someone here knows what I mean?

You may wish to compare the article that gregoryfl linked with William Cureton's report per 1858. Preface, page vi treats theܡܦܪܫܐ-header of Matthew's gospel.B.t.w, Cureton's opinion that Curetonian Matthew wasn't translated from greek is rare nowadays.